4 ms·
This happens within 2 seconds. I'm sorry but statements like that freak me out a bit. Do I get a warning when my instance is going to be migrated instead of r
by moe 14y ago
This happens within 2 seconds.
I'm sorry but statements like that freak me out a bit.
Do I get a warning when my instance is going to be migrated instead of resized, and an estimate of the downtime?
Because unless you found a way to defy physics you are pretty surely not migrating e.g. a 4GB Ram/40GB disk instance in anywhere close to 2 seconds.
- devopstom 14y agoActually.. If you had all of the instance data stored on a fast SAN, so that it was available to all of the hosts simultaneously (possible.) And you had an ultra-high speed interconnect (40Gbit Infiniband would do) between hosts, for sharing the memory state when you migrate.. 4GB of memory, at 40Gbit/s would be transferred in 0.8s. (assuming perfect throughput, all cows are spherical, etc..)
- accountoftheday 14y agoActually... you do not need that fast a network. You can converge state incrementally rather than transfer it in one go. Xen and VMware do this. Surely the cost of a fast SAN and interconnect would quickly outpace the (imho minor) savings from smaller memory allocations.
- devopstom 14y agoYeah, you can do that too..